ViewFlipper介绍
ViewFilpper类继承于ViewAnimator，而ViewAnimator类继承于FrameLayout。
ViewAnimator：
Base class for a FrameLayout container that will perform执行 animations when switching切换 between its views.
ViewFilpper：
Simple ViewAnimator that will animate between two or more views that have been added to it. Only one child is shown at a time. If requested, can automatically flip自动翻转 between each child at a regular interval间隔.
常用API
查看ViewAnimator类的源码可以看出此类的作用主要是为其中的View切换提供动画效果。该类有如下几个和动画相关的方法：
- setInAnimation(Animation)与setInAnimation(Context, resourceID)：设置View进入屏幕时候使用的动画
- setOutAnimation、getInAnimation、getOutAnimation：动画
- showNext、showPrevious：显示FrameLayout里面的下/上一个View
- getCurrentView：当前的View。Returns the View corresponding to the currently displayed child.
- setDisplayedChild、getDisplayedChild：正在显示的View的序号。Returns the index of the currently displayed child view.
- setAnimateFirstView(boolean animate)、getAnimateFirstView：True to animate the current View the first time it is displayed, false otherwise.
- 此外还有各种removeView方法。
- setFilpInterval：设置View切换的时间间隔，参数为毫秒
- startFlipping：开始进行View的切换，切换会循环进行
- stopFlipping：停止View切换
- isFlipping： 用来判断View切换是否正在进行 。Returns true if the child views are flipping.
- setAutoStart：设置是否自动开始，如果设置为true，当ViewFlipper显示的时候View的切换会自动开始
- isAutoStart：是否为自动开始，Returns true if this view automatically calls startFlipping() when it becomes attached to a window.
一般情况下，我们都会使用ViewFilpper类实现View的切换，而不使用它的父类ViewAnimator类。
案例
public class MainActivity extends Activity {
private ViewFlipper flipper1, flipper2;
private List<TBean> mList = new ArrayList<TBean>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);
flipper1 = new ViewFlipper(this);
flipper1.setBackgroundColor(0x330000ff);
flipper2 = new ViewFlipper(this);
flipper2.setBackgroundColor(0x33ff0000);
layout.addView(flipper1);
layout.addView(flipper2);
initFlipper(flipper1, R.anim.anim_in, R.anim.anim_out);
initFlipper(flipper2, R.anim.anim_in2, R.anim.anim_out2);
setContentView(layout, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
}
private void initFlipper(ViewFlipper flipper, int animIn, int animOut) {
mList.add(new TBean("疯传 家人给2岁孩子喝这个，孩子智力倒退10岁", "https://www.baidu.com/"));
mList.add(new TBean("哈哈 日本玩家33万甩卖15万张游戏王卡", "http://www.sina.com.cn/"));
mList.add(new TBean("头条 内疚逃命时没带够，回废墟狂挖30小时", "https://www.google.com.hk/"));
int size = mList.size();
for (int i = 0; i < size; i++) {
final int num = i;
TextView tv = new TextView(this);
tv.setText(mList.get(i).Title);
tv.setTextColor(0xff424954);
tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 13);
tv.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_launcher, 0, 0, 0);
tv.setGravity(Gravity.CENTER_VERTICAL);
tv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(mList.get(num).PageUrl)));
}
});
flipper.addView(tv);
}
flipper.setFlipInterval(3000);//间隔时间
flipper.setInAnimation(this, animIn);
flipper.setOutAnimation(this, animOut);
flipper.startFlipping();
}
public static class TBean {
public TBean(String title, String pageUrl) {
Title = title;
PageUrl = pageUrl;
}
public String Title;
public String PageUrl;
}
}